linux/arch/arm/Kconfig.debug
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   1menu "Kernel hacking"
   2
   3source "lib/Kconfig.debug"
   4
   5config STRICT_DEVMEM
   6        bool "Filter access to /dev/mem"
   7        depends on MMU
   8        ---help---
   9          If this option is disabled, you allow userspace (root) access to all
  10          of memory, including kernel and userspace memory. Accidental
  11          access to this is obviously disastrous, but specific access can
  12          be used by people debugging the kernel.
  13
  14          If this option is switched on, the /dev/mem file only allows
  15          userspace access to memory mapped peripherals.
  16
  17          If in doubt, say Y.
  18
  19# RMK wants arm kernels compiled with frame pointers or stack unwinding.
  20# If you know what you are doing and are willing to live without stack
  21# traces, you can get a slightly smaller kernel by setting this option to
  22# n, but then RMK will have to kill you ;).
  23config FRAME_POINTER
  24        bool
  25        depends on !THUMB2_KERNEL
  26        default y if !ARM_UNWIND || FUNCTION_GRAPH_TRACER
  27        help
  28          If you say N here, the resulting kernel will be slightly smaller and
  29          faster. However, if neither FRAME_POINTER nor ARM_UNWIND are enabled,
  30          when a problem occurs with the kernel, the information that is
  31          reported is severely limited.
  32
  33config ARM_UNWIND
  34        bool "Enable stack unwinding support (EXPERIMENTAL)"
  35        depends on AEABI && EXPERIMENTAL
  36        default y
  37        help
  38          This option enables stack unwinding support in the kernel
  39          using the information automatically generated by the
  40          compiler. The resulting kernel image is slightly bigger but
  41          the performance is not affected. Currently, this feature
  42          only works with EABI compilers. If unsure say Y.
  43
  44config OLD_MCOUNT
  45        bool
  46        depends on FUNCTION_TRACER && FRAME_POINTER
  47        default y
  48
  49config DEBUG_USER
  50        bool "Verbose user fault messages"
  51        help
  52          When a user program crashes due to an exception, the kernel can
  53          print a brief message explaining what the problem was. This is
  54          sometimes helpful for debugging but serves no purpose on a
  55          production system. Most people should say N here.
  56
  57          In addition, you need to pass user_debug=N on the kernel command
  58          line to enable this feature.  N consists of the sum of:
  59
  60              1 - undefined instruction events
  61              2 - system calls
  62              4 - invalid data aborts
  63              8 - SIGSEGV faults
  64             16 - SIGBUS faults
  65
  66# These options are only for real kernel hackers who want to get their hands dirty.
  67config DEBUG_LL
  68        bool "Kernel low-level debugging functions (read help!)"
  69        depends on DEBUG_KERNEL
  70        help
  71          Say Y here to include definitions of printascii, printch, printhex
  72          in the kernel.  This is helpful if you are debugging code that
  73          executes before the console is initialized.
  74
  75          Note that selecting this option will limit the kernel to a single
  76          UART definition, as specified below. Attempting to boot the kernel
  77          image on a different platform *will not work*, so this option should
  78          not be enabled for kernels that are intended to be portable.
  79
  80choice
  81        prompt "Kernel low-level debugging port"
  82        depends on DEBUG_LL
  83
  84        config AT91_DEBUG_LL_DBGU0
  85                bool "Kernel low-level debugging on rm9200, 9260/9g20, 9261/9g10 and 9rl"
  86                depends on HAVE_AT91_DBGU0
  87
  88        config AT91_DEBUG_LL_DBGU1
  89                bool "Kernel low-level debugging on 9263 and 9g45"
  90                depends on HAVE_AT91_DBGU1
  91
  92        config DEBUG_CLPS711X_UART1
  93                bool "Kernel low-level debugging messages via UART1"
  94                depends on ARCH_CLPS711X
  95                help
  96                  Say Y here if you want the debug print routines to direct
  97                  their output to the first serial port on these devices.
  98
  99        config DEBUG_CLPS711X_UART2
 100                bool "Kernel low-level debugging messages via UART2"
 101                depends on ARCH_CLPS711X
 102                help
 103                  Say Y here if you want the debug print routines to direct
 104                  their output to the second serial port on these devices.
 105
 106        config DEBUG_DAVINCI_DA8XX_UART1
 107                bool "Kernel low-level debugging on DaVinci DA8XX using UART1"
 108                depends on ARCH_DAVINCI_DA8XX
 109                help
 110                  Say Y here if you want the debug print routines to direct
 111                  their output to UART1 serial port on DaVinci DA8XX devices.
 112
 113        config DEBUG_DAVINCI_DA8XX_UART2
 114                bool "Kernel low-level debugging on DaVinci DA8XX using UART2"
 115                depends on ARCH_DAVINCI_DA8XX
 116                help
 117                  Say Y here if you want the debug print routines to direct
 118                  their output to UART2 serial port on DaVinci DA8XX devices.
 119
 120        config DEBUG_DAVINCI_DMx_UART0
 121                bool "Kernel low-level debugging on DaVinci DMx using UART0"
 122                depends on ARCH_DAVINCI_DMx
 123                help
 124                  Say Y here if you want the debug print routines to direct
 125                  their output to UART0 serial port on DaVinci DMx devices.
 126
 127        config DEBUG_DAVINCI_TNETV107X_UART1
 128                bool "Kernel low-level debugging on DaVinci TNETV107x using UART1"
 129                depends on ARCH_DAVINCI_TNETV107X
 130                help
 131                  Say Y here if you want the debug print routines to direct
 132                  their output to UART1 serial port on DaVinci TNETV107X
 133                  devices.
 134
 135        config DEBUG_DC21285_PORT
 136                bool "Kernel low-level debugging messages via footbridge serial port"
 137                depends on FOOTBRIDGE
 138                help
 139                  Say Y here if you want the debug print routines to direct
 140                  their output to the serial port in the DC21285 (Footbridge).
 141
 142        config DEBUG_FOOTBRIDGE_COM1
 143                bool "Kernel low-level debugging messages via footbridge 8250 at PCI COM1"
 144                depends on FOOTBRIDGE
 145                help
 146                  Say Y here if you want the debug print routines to direct
 147                  their output to the 8250 at PCI COM1.
 148
 149        config DEBUG_HIGHBANK_UART
 150                bool "Kernel low-level debugging messages via Highbank UART"
 151                depends on ARCH_HIGHBANK
 152                help
 153                  Say Y here if you want the debug print routines to direct
 154                  their output to the UART on Highbank based devices.
 155
 156        config DEBUG_IMX1_UART
 157                bool "i.MX1 Debug UART"
 158                depends on SOC_IMX1
 159                help
 160                  Say Y here if you want kernel low-level debugging support
 161                  on i.MX1.
 162
 163        config DEBUG_IMX23_UART
 164                bool "i.MX23 Debug UART"
 165                depends on SOC_IMX23
 166                help
 167                  Say Y here if you want kernel low-level debugging support
 168                  on i.MX23.
 169
 170        config DEBUG_IMX25_UART
 171                bool "i.MX25 Debug UART"
 172                depends on SOC_IMX25
 173                help
 174                  Say Y here if you want kernel low-level debugging support
 175                  on i.MX25.
 176
 177        config DEBUG_IMX21_IMX27_UART
 178                bool "i.MX21 and i.MX27 Debug UART"
 179                depends on SOC_IMX21 || SOC_IMX27
 180                help
 181                  Say Y here if you want kernel low-level debugging support
 182                  on i.MX21 or i.MX27.
 183
 184        config DEBUG_IMX28_UART
 185                bool "i.MX28 Debug UART"
 186                depends on SOC_IMX28
 187                help
 188                  Say Y here if you want kernel low-level debugging support
 189                  on i.MX28.
 190
 191        config DEBUG_IMX31_IMX35_UART
 192                bool "i.MX31 and i.MX35 Debug UART"
 193                depends on SOC_IMX31 || SOC_IMX35
 194                help
 195                  Say Y here if you want kernel low-level debugging support
 196                  on i.MX31 or i.MX35.
 197
 198        config DEBUG_IMX51_UART
 199                bool "i.MX51 Debug UART"
 200                depends on SOC_IMX51
 201                help
 202                  Say Y here if you want kernel low-level debugging support
 203                  on i.MX51.
 204
 205        config DEBUG_IMX50_IMX53_UART
 206                bool "i.MX50 and i.MX53 Debug UART"
 207                depends on SOC_IMX50 || SOC_IMX53
 208                help
 209                  Say Y here if you want kernel low-level debugging support
 210                  on i.MX50 or i.MX53.
 211
 212        config DEBUG_IMX6Q_UART2
 213                bool "i.MX6Q Debug UART2"
 214                depends on SOC_IMX6Q
 215                help
 216                  Say Y here if you want kernel low-level debugging support
 217                  on i.MX6Q UART2. This is correct for e.g. the SabreLite
 218                  board.
 219
 220        config DEBUG_IMX6Q_UART4
 221                bool "i.MX6Q Debug UART4"
 222                depends on SOC_IMX6Q
 223                help
 224                  Say Y here if you want kernel low-level debugging support
 225                  on i.MX6Q UART4.
 226
 227        config DEBUG_MMP_UART2
 228                bool "Kernel low-level debugging message via MMP UART2"
 229                depends on ARCH_MMP
 230                help
 231                  Say Y here if you want kernel low-level debugging support
 232                  on MMP UART2.
 233
 234        config DEBUG_MMP_UART3
 235                bool "Kernel low-level debugging message via MMP UART3"
 236                depends on ARCH_MMP
 237                help
 238                  Say Y here if you want kernel low-level debugging support
 239                  on MMP UART3.
 240
 241        config DEBUG_MSM_UART1
 242                bool "Kernel low-level debugging messages via MSM UART1"
 243                depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 244                help
 245                  Say Y here if you want the debug print routines to direct
 246                  their output to the first serial port on MSM devices.
 247
 248        config DEBUG_MSM_UART2
 249                bool "Kernel low-level debugging messages via MSM UART2"
 250                depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 251                help
 252                  Say Y here if you want the debug print routines to direct
 253                  their output to the second serial port on MSM devices.
 254
 255        config DEBUG_MSM_UART3
 256                bool "Kernel low-level debugging messages via MSM UART3"
 257                depends on ARCH_MSM7X00A || ARCH_MSM7X30 || ARCH_QSD8X50
 258                help
 259                  Say Y here if you want the debug print routines to direct
 260                  their output to the third serial port on MSM devices.
 261
 262        config DEBUG_MSM8660_UART
 263                bool "Kernel low-level debugging messages via MSM 8660 UART"
 264                depends on ARCH_MSM8X60
 265                select MSM_HAS_DEBUG_UART_HS
 266                help
 267                  Say Y here if you want the debug print routines to direct
 268                  their output to the serial port on MSM 8660 devices.
 269
 270        config DEBUG_MSM8960_UART
 271                bool "Kernel low-level debugging messages via MSM 8960 UART"
 272                depends on ARCH_MSM8960
 273                select MSM_HAS_DEBUG_UART_HS
 274                help
 275                  Say Y here if you want the debug print routines to direct
 276                  their output to the serial port on MSM 8960 devices.
 277
 278        config DEBUG_MVEBU_UART
 279                bool "Kernel low-level debugging messages via MVEBU UART"
 280                depends on ARCH_MVEBU
 281                help
 282                  Say Y here if you want kernel low-level debugging support
 283                  on MVEBU based platforms.
 284
 285        config DEBUG_PICOXCELL_UART
 286                depends on ARCH_PICOXCELL
 287                bool "Use PicoXcell UART for low-level debug"
 288                help
 289                  Say Y here if you want kernel low-level debugging support
 290                  on PicoXcell based platforms.
 291
 292        config DEBUG_REALVIEW_STD_PORT
 293                bool "RealView Default UART"
 294                depends on ARCH_REALVIEW
 295                help
 296                  Say Y here if you want the debug print routines to direct
 297                  their output to the serial port on RealView EB, PB11MP, PBA8
 298                  and PBX platforms.
 299
 300        config DEBUG_REALVIEW_PB1176_PORT
 301                bool "RealView PB1176 UART"
 302                depends on MACH_REALVIEW_PB1176
 303                help
 304                  Say Y here if you want the debug print routines to direct
 305                  their output to the standard serial port on the RealView
 306                  PB1176 platform.
 307
 308        config DEBUG_S3C_UART0
 309                depends on PLAT_SAMSUNG
 310                bool "Use S3C UART 0 for low-level debug"
 311                help
 312                  Say Y here if you want the debug print routines to direct
 313                  their output to UART 0. The port must have been initialised
 314                  by the boot-loader before use.
 315
 316                  The uncompressor code port configuration is now handled
 317                  by CONFIG_S3C_LOWLEVEL_UART_PORT.
 318
 319        config DEBUG_S3C_UART1
 320                depends on PLAT_SAMSUNG
 321                bool "Use S3C UART 1 for low-level debug"
 322                help
 323                  Say Y here if you want the debug print routines to direct
 324                  their output to UART 1. The port must have been initialised
 325                  by the boot-loader before use.
 326
 327                  The uncompressor code port configuration is now handled
 328                  by CONFIG_S3C_LOWLEVEL_UART_PORT.
 329
 330        config DEBUG_S3C_UART2
 331                depends on PLAT_SAMSUNG
 332                bool "Use S3C UART 2 for low-level debug"
 333                help
 334                  Say Y here if you want the debug print routines to direct
 335                  their output to UART 2. The port must have been initialised
 336                  by the boot-loader before use.
 337
 338                  The uncompressor code port configuration is now handled
 339                  by CONFIG_S3C_LOWLEVEL_UART_PORT.
 340
 341        config DEBUG_SOCFPGA_UART
 342                depends on ARCH_SOCFPGA
 343                bool "Use SOCFPGA UART for low-level debug"
 344                help
 345                  Say Y here if you want kernel low-level debugging support
 346                  on SOCFPGA based platforms.
 347
 348        config DEBUG_VEXPRESS_UART0_DETECT
 349                bool "Autodetect UART0 on Versatile Express Cortex-A core tiles"
 350                depends on ARCH_VEXPRESS && CPU_CP15_MMU
 351                help
 352                  This option enables a simple heuristic which tries to determine
 353                  the motherboard's memory map variant (original or RS1) and then
 354                  choose the relevant UART0 base address.
 355
 356                  Note that this will only work with standard A-class core tiles,
 357                  and may fail with non-standard SMM or custom software models.
 358
 359        config DEBUG_VEXPRESS_UART0_CA9
 360                bool "Use PL011 UART0 at 0x10009000 (V2P-CA9 core tile)"
 361                depends on ARCH_VEXPRESS
 362                help
 363                  This option selects UART0 at 0x10009000. Except for custom models,
 364                  this applies only to the V2P-CA9 tile.
 365
 366        config DEBUG_VEXPRESS_UART0_RS1
 367                bool "Use PL011 UART0 at 0x1c090000 (RS1 complaint tiles)"
 368                depends on ARCH_VEXPRESS
 369                help
 370                  This option selects UART0 at 0x1c090000. This applies to most
 371                  of the tiles using the RS1 memory map, including all new A-class
 372                  core tiles, FPGA-based SMMs and software models.
 373
 374        config DEBUG_LL_UART_NONE
 375                bool "No low-level debugging UART"
 376                depends on !ARCH_MULTIPLATFORM
 377                help
 378                  Say Y here if your platform doesn't provide a UART option
 379                  below. This relies on your platform choosing the right UART
 380                  definition internally in order for low-level debugging to
 381                  work.
 382
 383        config DEBUG_ICEDCC
 384                bool "Kernel low-level debugging via EmbeddedICE DCC channel"
 385                help
 386                  Say Y here if you want the debug print routines to direct
 387                  their output to the EmbeddedICE macrocell's DCC channel using
 388                  co-processor 14. This is known to work on the ARM9 style ICE
 389                  channel and on the XScale with the PEEDI.
 390
 391                  Note that the system will appear to hang during boot if there
 392                  is nothing connected to read from the DCC.
 393
 394        config DEBUG_SEMIHOSTING
 395                bool "Kernel low-level debug output via semihosting I/O"
 396                help
 397                  Semihosting enables code running on an ARM target to use
 398                  the I/O facilities on a host debugger/emulator through a
 399                  simple SVC call. The host debugger or emulator must have
 400                  semihosting enabled for the special svc call to be trapped
 401                  otherwise the kernel will crash.
 402
 403                  This is known to work with OpenOCD, as well as
 404                  ARM's Fast Models, or any other controlling environment
 405                  that implements semihosting.
 406
 407                  For more details about semihosting, please see
 408                  chapter 8 of DUI0203I_rvct_developer_guide.pdf from ARM Ltd.
 409
 410endchoice
 411
 412config DEBUG_LL_INCLUDE
 413        string
 414        default "debug/icedcc.S" if DEBUG_ICEDCC
 415        default "debug/highbank.S" if DEBUG_HIGHBANK_UART
 416        default "debug/mvebu.S" if DEBUG_MVEBU_UART
 417        default "debug/picoxcell.S" if DEBUG_PICOXCELL_UART
 418        default "debug/socfpga.S" if DEBUG_SOCFPGA_UART
 419        default "debug/vexpress.S" if DEBUG_VEXPRESS_UART0_DETECT || \
 420                DEBUG_VEXPRESS_UART0_CA9 || DEBUG_VEXPRESS_UART0_RS1
 421        default "mach/debug-macro.S"
 422
 423config EARLY_PRINTK
 424        bool "Early printk"
 425        depends on DEBUG_LL
 426        help
 427          Say Y here if you want to have an early console using the
 428          kernel low-level debugging functions. Add earlyprintk to your
 429          kernel parameters to enable this console.
 430
 431config OC_ETM
 432        bool "On-chip ETM and ETB"
 433        depends on ARM_AMBA
 434        help
 435          Enables the on-chip embedded trace macrocell and embedded trace
 436          buffer driver that will allow you to collect traces of the
 437          kernel code.
 438
 439config ARM_KPROBES_TEST
 440        tristate "Kprobes test module"
 441        depends on KPROBES && MODULES
 442        help
 443          Perform tests of kprobes API and instruction set simulation.
 444
 445config PID_IN_CONTEXTIDR
 446        bool "Write the current PID to the CONTEXTIDR register"
 447        depends on CPU_COPY_V6
 448        help
 449          Enabling this option causes the kernel to write the current PID to
 450          the PROCID field of the CONTEXTIDR register, at the expense of some
 451          additional instructions during context switch. Say Y here only if you
 452          are planning to use hardware trace tools with this kernel.
 453
 454endmenu
 455
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